Furnace stack



Nov. 27, 192s.-

C. H. WAGNER FURNACE STACK Filed Nov. 28, 1924 TTORNEYS Patented Nov. 27, 1928.

rrEo STATES PATENT OFFICE. I

en'annns H. wAeNEnfo r MILWAUKEE, WISCONSIN, ASSIGNOR To L. J. MUELLER FURNACE ooMrANY, or MILWAUKEE, WlSCONSIN, A conronnrron on WISCONSIN.

FURNACE STACK.

Application filed November 28, 1924. Serial No. 752,663.

This invention relates; to improvements in furin ce stacks more particularly adapted for conveying hot air "from the furnace to the rooms to be heated. p

In furnace installations the hot air pipes or stacks are usually formed in sections and the sections are assembled on the job by the workmen installing the heating plant. In assembling it is necessary to connect and disconnect the stack sections a number of times and it is desirable to provide a stack section joint which while holding the parts firmly together will permit the easy separation of the sections with the minimum effort.

A further objectof the invention is to provide a furnace stack of the double wall typewhich is formed ofbut two pieces of metal. r i

It is one of theobjects of the present invention to provide a furnace stack which willpermit the joining of the sections together or the separation of the parts in a very simple manner. 1 I

A. further object of the invention is to provide a'furnace stack having a yielding lockpermit the sections the invention consists of the improved furnace stack and its parts and combinations as set forth in the claim, and all equivalents thereof. v V

In the accompanying drawing in which the same reference characters indicate the same parts in all of the views: v

Fig. 1 is a top view ofthe improved furnace stack; 7 a

Fig. 2 is a side view of two stack sections connected together, portions being shown in section to illustrate interior construction;'

and Fig. 3 is an end view of the parts shown in Fig. 2.

Referring to the drawing the numeral 5 mg means for locking two sections together indicates the outer wall and 6 the inner wall of I the improved furnace stack which are bent at right angles transverselyto form the inner hot air duct 7 and the surrounding ins sulating space 8. The inside wall 6 extends upwardly in a straight hue and its upper edge is overlapped by the channeled upper portion 9 of the outer wall 5. Said outer wall at its upper portion is bent outwardly and inwardly to form a stop rib 10 thenup wardly a slight distance to provide an outer alining portion 11. The said wall is then angled inwardly upwardly and'then abruptly outwardly to form a yielding locking shoulder 12 havingv a rounded outer edge portion and the metal is then inclined upwardly inwardly to form a guide portion 13, and then continues upwardly to form the channel part 9 before mentioned. Said channel part 9 also forms an alining part 9 for theconnected section and. is crimped diagonally as indicated by the numeral 9 to more firmly connect the channeled part and the upper edge of the inner wall togeher.

angled inwardly to form a stop rib 6 and then angled outwardly downwardly to the inner surface of theouter wall 5 to form the inner wall guide portion 14. The said portioii then curves inwardly and then downwardly outwardly to the outer wall to form the fixed locking shoulder 15. The lower edge portion of the inner Wallis then bent downwardly in a straight line to form an inner wall aiining portion 16 and then bent outwardly upwardly to form a channel 17 which overlaps the lower edge of the outer wall 5as clearly shown in Fig. 2. The lower angled portiens just described are shaped to correspond to the angles of upper end of the stack so that when two sections engage each The lower portion of the inner wall 6 also freely permit the-locking shoulder por-- tion to yield inwardly when the partsare being disengaged or interlocked.

Said openings 19 while enclosed within the partly telescoped sections register with the corner openings 20 to permit the circulation of the insulating air through the registering openings but maintaining a closed passages way for the hot air within the inner wall 6.

The stop rihs 6 and 10 assist in holding the-sections in alined position while the locking shoulders 12 and 15 firmly loclnthe sections together but permitting their easy separationa if desired; V l Vhile only one sidewall formed of an inner andan outer wall has been described it is to be understoodthat the complete stack section. includes four corresponding walls forming a rectangular shaped conduit'haw ing an; innerhot air passageway and a sur rounding insulating air space. I From the foregoing, description it. will he seen that the yielding locking connection is oi very simple. construction and well adaptec for thepurpose described.

lVhat. Iv claimras my invention is Airfrnacestack, comprising, a stack section formed of inner and outer Walls in spaced relation, the upper portion of the outer wall being bent to, form an outwardly. projecting; stoprih and then extending upwardly in. a straight line to provide an,

alining portion and then extendingdnwardl'y upwardly and then outwardly inrspaced relation to the inner wall to form a yielding looking. shoulder extending. approximately at:

towards the inner wallto form a guide pore tion, and then extending upwardly in a straight. line to tormlan; alining: par-t and is then bent-1 downwardly to, form; a channel into:

which the upper edgeaof the inner wallextends and is secured the lower )ortion of they 7 inner wall: heing'bent inwardly toform fa stop rib" and then extendingdownwardly1n a straight. line for ashort distance and then;

inclined downwardly outwardly toth e-ou ter:

wall to form a guide part and 'then bent in wardi a onroxiinatel at ri ht an des: tobthea 1 a: c

inclined portion and; then is bent: downwardly outwardly to form. a non syieldingq locking. shoulder which contacts with the outer w ll, the lower edge portion of said:

inner wall then vextending downwardly; in a straight line and then bent outwardly and:

upwardly lower edge of the outer wall extends andis secured, the corner portions ofsaid stack section being open to. permit the circulationrof air through saidopeningsi- V lntestimony whereof, I. affix my signature;

CHARLES H. WAGNER.

to form a channel-into which'the: 

